Modeling and Control of Axial and Torsional Stick-Slip Oscillations in Drill String

A drill string is the transmission component of rotary drill-rig system used for mining petroleum and natural gas resources. The drill string system is essentially a long slender structure whose length can be in kilometers. Additionally, the drill-string is subjected to discontinuous forces from interactions with the wellbore, which can cause erratic torsion oscillations and stick-slip motions. Throughout this report, all the information that is needed to execute this project will be explain in chapter 1 which is introduction that consist of background of the project, the problem statement of the project and the objectives of doing this project. The literature review of this project will be explained after the introduction. All the studies about this project in order to gain insights into the drill string dynamics and reduce order model have been stated in the literature review. In chapter 3, the methodology in doing this project will be explained which consists of project flow, Gantt chart and the key milestone of doing this project. Furthermore, the results and discussion during this Final Year Project have been concluded and the findings are presented in chapter 4 in this report. These findings provide the simulation code in forms of MATLAB code. This report effort provides clues to how the drive speed can be used as a control parameter to move the system out of regions of undesired and how the drill-string motions can be influenced to keep them close to the borehole center.